Hi John,
Take a look at the ‘Scheduling’ options at the FileSet/FTP Local properties.
You should increase the ‘Max messages’ from 1 to about 100 (just a wild guess on my part). This means every 5 (= Read Interval) seconds 100 messages will be processed, instead of just one.
Zuyderland Medisch Centrum; Heerlen/Sittard; The Netherlands